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Implementation of Active Flow Control using Microjets on an RC Aircraft

Implementation of Active Flow Control using Microjets on an RC Aircraft. Dan Drake Phil Kreth Hussein Nabulsi Matt Tubtim Faculty Advisor: Dr. Farrukh Alvi Sponsor: Dr. Gregg Abate (Eglin AFB). Background. Flow separated ~16° AOA. Reattached flow ~ 5 psig @ microjets. Flow Separation.

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Implementation of Active Flow Control using Microjets on an RC Aircraft

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  1. Implementation of Active Flow Control using Microjets on an RC Aircraft Dan Drake Phil Kreth Hussein Nabulsi Matt Tubtim Faculty Advisor: Dr. Farrukh Alvi Sponsor: Dr. Gregg Abate (Eglin AFB)

  2. Background Flow separated ~16° AOA Reattached flow ~ 5 psig @ microjets Flow Separation 04.03.2008

  3. Motivation • ONERA D Airfoil • Span = 1 m, Chord = 0.35 • U= 45 m/s,  = 14 • Control applied to 40% of span Flow with Control Baseline flow *Conducted at the Université de Poitiers, France Images & Video Courtesy of Dr. Farrukh Alvi 04.03.2008

  4. Motivation 20-30% gain in CL Control applied to 40% of span Images Courtesy of Dr. Farrukh Alvi 04.03.2008

  5. Needs Assessment Implement microjets on RC Airplane Remotely activate each wing Run time should be 30 secs or more Delay stall and improve lift Use off-the-shelf items only Budget = $1,50000 04.03.2008

  6. Wind Tunnel Testing 04.03.2008 • Paint Testing • Uncertainty in interpretation • Smoke Wire • Minimum WT speed too high • Tuft Testing • Success

  7. Flow Reattachment Video 04.03.2008

  8. Air Supply Method

  9. Air Supply Method

  10. Performance Measurements

  11. Final Design Schematic 04.03.2008

  12. Actual Design 04.03.2008

  13. Final Design Components Overhead View Close-up view: Tank Regulator Valves 04.03.2008

  14. High Pressure Tank Location 04.03.2008

  15. Shielding for High Pressure Cylinder 04.03.2008

  16. Pressure Manifolds and Microjets in Wing to microjets from valves 04.03.2008

  17. Budget & Weight Added Weight: 10 lbs Total Weight: 14 lbs 04.03.2008

  18. Test Plan • Video aircraft on ground • Show all systems in working order • Flight testing, no control • Flight testing, with control • Acquire video from on-board camera 04.03.2008

  19. Flight Test Goals Don’t crash! Demonstrate reattachment 04.03.2008

  20. Flight Test Video 04.03.2008

  21. Outcomes & Conclusions • System was successful • No “bad landings” • Microjets remotely activated • Reattached flow demonstrated • Proposed Future Work • Demonstrate Roll Control • Measure CL and CD improvements 04.03.2008

  22. Special Thanks • Eglin Air Force Base • Dr. Gregg Abate • AAPL – FAMU-FSU • Dr. Farrukh Alvi • Mechanical Engineering Dept • Dr. Cesar Luongo • Mr. Jon Cloos 04.03.2008

  23. Questions and Comments 04.03.2008

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